Search

Your search keyword '"Keene, David"' showing total 1,211 results
Start Over Author "Keene, David"
1,211 results on '"Keene, David"'

9. Magnetically dependent plasmon drag in permalloy structures

Author

Shahabuddin, Mohammad, Keene, David W., Durac, Maxim, Posvyanskii, Vladimir S., Atsarkin, Vadim A., and Noginova, Natalia

Subjects
Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Significant photovoltages are observed in permalloy grating-like structures in response to pulsed laser light illumination. Electric signals are enhanced at plasmon resonance conditions and show a clear dependence on the magnetic field with a characteristic hysteresis. Estimations show that the effect could not be explained solely by the laser-induced heating. Alternative mechanisms are discussed., Comment: 7 pages, 4 figures

Published
2019

11. A genome-wide association study with tissue transcriptomics identifies genetic drivers for classic bladder exstrophy

Author

Mingardo, Enrico, Beaman, Glenda, Grote, Philip, Nordenskjöld, Agneta, Newman, William, Woolf, Adrian S., Eckstein, Markus, Hilger, Alina C., Dworschak, Gabriel C., Rösch, Wolfgang, Ebert, Anne-Karolin, Stein, Raimund, Brusco, Alfredo, Di Grazia, Massimo, Tamer, Ali, Torres, Federico M., Hernandez, Jose L., Erben, Philipp, Maj, Carlo, Olmos, Jose M., Riancho, Jose A., Valero, Carmen, Hostettler, Isabel C., Houlden, Henry, Werring, David J., Schumacher, Johannes, Gehlen, Jan, Giel, Ann-Sophie, Buerfent, Benedikt C., Arkani, Samara, Åkesson, Elisabeth, Rotstein, Emilia, Ludwig, Michael, Holmdahl, Gundela, Giorgio, Elisa, Berettini, Alfredo, Keene, David, Cervellione, Raimondo M., Younsi, Nina, Ortlieb, Melissa, Oswald, Josef, Haid, Bernhard, Promm, Martin, Neissner, Claudia, Hirsch, Karin, Stehr, Maximilian, Schäfer, Frank-Mattias, Schmiedeke, Eberhard, Boemers, Thomas M., van Rooij, Iris A. L. M., Feitz, Wouter F. J., Marcelis, Carlo L. M., Lacher, Martin, Nelson, Jana, Ure, Benno, Fortmann, Caroline, Gale, Daniel P., Chan, Melanie M. Y., Ludwig, Kerstin U., Nöthen, Markus M., Heilmann, Stefanie, Zwink, Nadine, Jenetzky, Ekkehart, Odermatt, Benjamin, Knapp, Michael, and Reutter, Heiko

Published
2022
Full Text
View/download PDF

14. Progressive exercise compared with best practice advice, with or without corticosteroid injection, for the treatment of patients with rotator cuff disorders (GRASP): a multicentre, pragmatic, 2 × 2 factorial, randomised controlled trial

Author

Bateman, Marcus, Hallett, Alison, Thompson, Helen, Willmore, Elaine, McCann, Lucy, Price, Jonathan, Smith, Neil, Kardamilas, Harry, Hurst, Matt, Andrews, Tim, Wells, Lori, De Matas, Chloe, Jaykumar, Arun, Grove, Sean, Birch, Corinne, Bury, Julie, Blacknall, James, Jessop, Sally, Boucher, Llewelyn, Sandbach, Robert, Lalande, Stacey, Dickson, Gill, Larkin, Treena, Cummings, Carole, Hopewell, Sally, Keene, David J, Marian, Ioana R, Dritsaki, Melina, Heine, Peter, Cureton, Lucy, Dutton, Susan J, Dakin, Helen, Carr, Andrew, Hamilton, Willie, Hansen, Zara, Jaggi, Anju, Littlewood, Chris, Barker, Karen L, Gray, Alastair, and Lamb, Sarah E

Published
2021
Full Text
View/download PDF

16. Ultimately Thin Metasurface Wave Plates

Author

Keene, David, LePain, Matthew, and Durach, Maxim

Subjects
Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

Optical properties of a metasurface which can be considered a monolayer of two classical uniaxial metamaterials, parallel-plate and nanorod arrays, are investigated. It is shown that such metasurface acts as an ultimately thin sub-50 nm wave plate. This is achieved via an interplay of epsilon-near-zero and epsilon-near-pole behavior along different axes in the plane of the metasurface allowing for extremely rapid phase difference accumulation in very thin metasurface layers. These effects are shown to not be disrupted by non-locality and can be applied to the design of ultrathin wave plates, Pancharatnam-Berry phase optical elements and plasmon-carrying optical torque wrench devices., Comment: 12 pages, 7 figures

Published
2015
Full Text
View/download PDF

17. Hyperbolic Resonances of Metasurface Cavities

Author

Keene, David and Durach, Maxim

Subjects
Physics - Optics
Abstract

We propose a new class of optical resonator structures featuring one or two metasurface reflectors or metacavities and predict that such resonators support novel hyperbolic resonances. As an example of such resonances we introduce hyperbolic Tamm plasmons (HTPs) and hyperbolic Fabry-Perot resonances (HFPs). The hyperbolic optical modes feature low-loss incident power re-distribution over TM and TE polarization output channels, clover-leaf anisotropic dispersion, and other unique properties which are tunable and are useful for multiple applications., Comment: 20 pages, 10 figures

Published
2015
Full Text
View/download PDF

18. Knee4Life: Empowering Knee Recovery After Total Knee Replacement Through Digital Health Protocol.

Author

Mansoubi, Maedeh, Leveridge, Phaedra, Smith, Matthew, Fox, Amelia, Massey, Garry, Lamb, Sarah E., Keene, David J., Newell, Paul, Jacobs, Elizabeth, Kalson, Nicholas S., Haron, Athia, and Dawes, Helen

Subjects
TOTAL knee replacement, MACHINE learning, COMPUTER vision, MEDICAL personnel, KNEE surgery, ARTIFICIAL joints, MOTION capture (Human mechanics)
Abstract

Pain and knee stiffness are common problems following total knee replacement surgery, with 10–20% of patients reporting dissatisfaction following their procedure. A remote assessment of knee stiffness could improve outcomes through continuous monitoring, facilitating timely intervention. Using machine learning algorithms, computer vision can extract joint angles from video footage, offering a method to monitor knee range of motion in patients' homes. This study outlines a protocol to provide proof of concept and validate a computer vision-based approach for measuring knee range of motion in individuals who have undergone total knee replacement. The study also explores the feasibility of integrating this technology into clinical practice, enhancing post-operative care. The study is divided into three components: carrying out focus groups, validating the computer vision-based software, and home testing. The focus groups will involve five people who underwent total knee replacement and ten healthcare professionals or carers who will discuss the deployment of the software in clinical settings. For the validation phase, 60 participants, including 30 patients who underwent total knee replacement surgery five to nine weeks prior and 30 healthy controls, will be recruited. The participants will perform five tasks, including the sit-to-stand test, where knee range of motion will be measured using computer vision-based markerless motion capture software, marker-based motion capture, and physiotherapy assessments. The accuracy and reliability of the software will be evaluated against these established methods. Participants will perform the sit-to-stand task at home. This will allow for a comparison between home-recorded and lab-based data. The findings from this study have the potential to significantly enhance the monitoring of knee stiffness following total knee replacement. By providing accurate, remote measurements and enabling the early detection of issues, this technology could facilitate timely referrals to non-surgical treatments, ultimately reducing the need for costly and invasive procedures to improve knee range of motion. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

21. The FAME trial study protocol: In younger adults with unstable ankle fractures treated with close contact casting, is ankle function not worse than those treated with surgical intervention?

Author

Achten, Juul, primary, Marques, Elsa M. R., additional, Pinedo-Villanueva, Rafael, additional, Whitehouse, Michael R., additional, Eardley, William G. P., additional, Costa, Matthew L., additional, Kearney, Rebecca S., additional, Keene, David J., additional, and Griffin, Xavier L., additional

Published
2024
Full Text
View/download PDF

23. Spontaneous emission of electric and magnetic dipoles in the vicinity of thin and thick metal

Author

Hussain, Rabia, Keene, David, Noginova, Natalia, and Durach, Maxim

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics
Abstract

Strong modification of spontaneous emission of Eu3+ ions placed in close vicinity to thin and thick gold and silver films was clearly demonstrated in a microscope setup separately for electric and magnetic dipole transitions. We have shown that the magnetic transition was very sensitive to the thickness of the gold substrate and behaved distinctly different from the electric transition. The observations were described theoretically based on the dyadic Green's function approach for layered media and explained through modified image models for the near and far-field emissions. We established that there exists a "near-field event horizon", which demarcates the distance from the metal at which the dipole emission is taken up exclusively in the near field., Comment: 11 pages, 7 figures

Published
2013
Full Text
View/download PDF

30. Optimising mobility outcomes after severe ankle injury in adults

Author

Keene, David J., Lamb, Sarah E., and Willett, Keith

Subjects
617.5, Orthopaedics, ankle, fractures, sprains, gait disorders, orthopedic apparatus
Abstract

Severe ankle injuries can result in ligament rupture or a fracture. A major problem after such injuries is limitation in mobility. Weight bearing tasks, such as walking, become a problem because of pain, deficits in joint range of motion and muscle strength. This thesis studies a key dilemma in early rehabilitation, whether to immobilise the ankle or allow joint motion to improve mobility outcomes. Studies have focused on two scenarios, severe ligament rupture, and unstable fractures managed through open reduction and internal fixation (ORIF). The analysis of gait outcomes was an important component of this thesis and a novel analytical method was developed to normalise gait velocity in the estimation of speed-dependent gait outcomes. A systematic review and meta-analysis was conducted including evidence to July 2014. The reporting and design of trials was universally poor. In the 6 weeks of recovery following ankle ORIF surgery, there was insufficient evidence that early ankle movements offered a benefit to mobility recovery compared with immobilisation in a cast. Ankle movements compared with immobilisation reduced the risk of venous thrombosis/thromboembolism. However, compared with cast immobilisation, the risk of deep and superficial surgical site infection and fixation-related complications were higher when ankle movements were permitted. To investigate the role of ankle supports in rehabilitation of walking after ORIF, two randomised cross-over studies were completed. In healthy participants with non-pathological gait, a walker boot induced gait abnormalities when compared with Tubigrip (elasticated bandage). There were no important differences in gait between a stirrup brace and Tubigrip. In people who had undergone ankle ORIF 6 weeks previously, a walker boot and to a lesser extent a stirrup brace offered improvements in gait symmetry and lower pain scores when compared with Tubigrip. Finally, a secondary analysis of the Collaborative Ankle Support Trial cohort (n=584) was conducted, which concluded that, in comparison to Tubigrip, 10 days of cast immobilisation provided greater probability of recovery of a range of mobility outcomes 4 weeks following injury. This thesis contributes evidence favouring a role for ankle immobilisation in improving mobility following severe ankle injury in adults. Clinicians should be aware of the benefits and risk of harms outlined, as well as the limitations in the current evidence base.

Published
2014

31. Varicocele

Author

Melling, Charlotte V., primary, Keene, David J.B., additional, and Cervellione, Raimondo M., additional

Published
2020
Full Text
View/download PDF

46. Parental decisional satisfaction after hypospadias repair in the United Kingdom

Author

Godse, Alok, Lall, Anupam, Taghizadeh, Arash, Lee, Boma, Driver, Chris, Keene, David, Marshall, David, Murphy, Feilim, McAndrew, Fiona, Nicholls, Guy, Chandran, Harish, Steinbrecher, Henrik, Evans, Kathryn, McCarthy, Liam, Steven, Mairi, Shenoy, Manoj, Farrugia, Marie-Klaire, Woodward, Mark, Flett, Martyn, Gopal, Milan, Godbole, Prasad, Daniel, Rejoo, Romero, Rosa M., Wragg, Ruth, Manoharan, Sengamalai, Griffin, Stephen, O'Toole, Stuart, Abbas, Tariq, Kalidasan, Varadarajan, Bethell, G.S., Chhabra, S., Shalaby, M.S., Corbett, H., and Kenny, S.E.

Published
2020
Full Text
View/download PDF

50. Beyond the VR Hype-Collective VR and the New Technology Landscape: Video, Staging, and More Serious VR Tools are Creating New Immersive Experiences Beyond the Stage

Author

Keene, David

Subjects
Arts and entertainment industries, Business, Electronics and electrical industries
Abstract

At the SXSW Interactive conference each year, the term 'Interactive' has usually been painted in huge, rolling strokes that cover any and everything from autonomous cars to music streaming and [...]

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results